根据料柱骨架理论和喷煤技术经济分析，提出了高炉喷煤极限和临界置换比的新概念；

According to the theory on stock column skeleton of BF and the economic analysis of injection, a new concept on limit of injected coal and critical replacement ratio is proposed.

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指出大量喷煤，达到喷煤量极限的关键在于改善料柱透气性，提高高炉冶炼水平。关。

It is shown the key point of reaching the limit of coal injection is improvement of permeability of stock column and enhanced BF operation.

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碱金属是导致高炉料柱透气性恶化、炉况失常、频繁悬料和在炉身结瘤的一个重要原因。

Alkali metals are one of the important causes that leads to poor permeability of charge column, irregular furnace operation, frequent hanging and scaffolding in the stack.

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